What’s the handheld particle counter work for?

Handheld particle counter is for helping air purifier and other air cleaning selling.
pm 2.5 ( particulate matter ) is the main reason of air pollution.
Air purifier can filter it to keep human body health.
It is too small to see, also can’t be feel.
Handheld particle counter show customers the data before and after using air purifier.
They will trust air cleaning is work and filtering the air.
By this way helping air purifier selling.

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